bblimke/webmock · error · ArgumentError

both arg and block given for HTTP method

Error message

both arg and block given for HTTP method

What it means

Error "both arg and block given for HTTP method" thrown in bblimke/webmock.

Source

Thrown at lib/webmock/http_lib_adapters/net_http_response.rb:24

# is called with a destination string or block.
#
# This causes a problem when VCR records a response--it reads the body before yielding
# the response, and if the code that is consuming the HTTP requests uses #read_body, it
# can cause an error.
#
# This is a bit of a hack, but it allows a Net::HTTP response to be "re-read"
# after it has aleady been read.  This attemps to preserve the behavior of
# #read_body, acting just as if it had never been read.


module Net
  module WebMockHTTPResponse
    def read_body(dest = nil, &block)
      if !(defined?(@__read_body_previously_called).nil?) && @__read_body_previously_called
        return super
      end
      return @body if dest.nil? && block.nil?
      raise ArgumentError.new("both arg and block given for HTTP method") if dest && block
      return nil if @body.nil?

      dest ||= ::Net::ReadAdapter.new(block)
      dest << @body.dup
      @body = dest
    ensure
      # allow subsequent calls to #read_body to proceed as normal, without our hack...
      @__read_body_previously_called = true
    end
  end
end

View on GitHub (pinned to b187df8827)

When it happens

Trigger: Thrown at lib/webmock/http_lib_adapters/net_http_response.rb:24 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of bblimke/webmock@b187df8827 (2026-08-23). Data as JSON: /api/errors/6fb478ee75f4a4fa. Report an issue: GitHub.